Heres one for you. I plugged in my wifes Ipod Shuffle into the arm rest USB. The Shuffle has 60 some songs loaded and they all play just fine with headset. When plugged into the car, only 1 thru 21 play. If you hit the arrow button to move to the next song when on 21, it goes back to number 1. Not sure why this would happen, very odd.